Ossification of posterior longitudinal ligament.
D000368:Aged; D006801:Humans; D008022:Ligaments / Q000000981:diagnostic imaging*; D008297:Male; D009192:Myelography; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging* / Q000601:surgery; D013128:Spinal Osteophytosis / Q000000981:diagnostic imaging* / Q000601:surgery; D014056:Tomography, X-Ray